Improvement in bearing-bars for furnace-grates



G.D.PUTNAM.

Bearing-Bars for Furnace-rates- No.l50,353 PatentedApri128,1874.

ZIWJJM v fa- 52 im UNITED STATES PATENT OFFICE.

GEORGE D. PUTNAM, OE BOSTON, MASSACHUSETTS.

IMPROVEMENT lN BEARING-BARS FOR FURNCEGRATES.l

Specification forming part of Letters Patent No. 150,353, dated April 2S, 1874; application filed March 28, 1874.

CASE A.

To all whom t may concern:

Be it known that I, GEORGE D. PUTNAM, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Bearin g-Bars for Grate- Bars; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings making a part of this specification, in which- Figure lis a perspective view of a section of a bearingbar. Fig. 2 is a cross-section of the same, showing the bearing-bars in position, with a grate-bar in place.

The same letters are employed in both figures to designate identical parts.

The object ofthe bearing-bar which is the subject ot' my invention is to support the gratebars in furnaces, so as to allow of their expansion and contraction, and to prevent them from twisting' and sagging. In the ordinary bearin gbars, it' the grate-bars do not till out the width of the furnace, they are liable to cant over on their sides, stopping up the air spaces, when they become red hot, and are soon rendered useless. Again, the ordinary bearing-bars are liable to be s0 placed, or to be so bent after being properly placed, that the ashes cannot escape between them and the walls, and the grate-bars, bearing against the ashes which will accumulate and be packed between their ends and the walls, can no longer expand, and will, consequently, be warped and twisted.

The manner in which my improved bearingbars obviatethese difficulties will readily appear from the following specification and claim.

In the annexed drawings, A is the body of the bar, flat along one face, and having a molding, A', along the lower edge on the other face, forming a foot on which the bar rests, and strengthening it. A series of partitions, B B, are cast upon the upper edge of the bar A., placed at suitable intervals, to receive and sustain the ends of the grate-bars. These partitions project on the sides 0f the furnace-walls a sufficient distance to maintain an air-space between the bar and the wall, so that not only may the temperature of the bearing-bar be kept down by the current of cold air ascending between it and the wall, but the ac- .ing-bar, and fla-t at the other end, as shown at E, so that the grate-bar may freely expand and contract without straining the bearing'- bars.

The length of the partitions B B should be somewhat less than the thickness vertically of the ends of the grate-bars, so that they may be protected, by the thickness of a bed of ashes resting upon their ends between the grate-bars, from the action of the tire.

It is obvious that the form of this bearingbar may be changed', to adapt it to grates of different forms. I do not, therefore, limit my claim to the precise form shown; but

What I claim as my invention, and desire to secure by Letters Patent, is

Bearing-bars for furnace-grates, constructed with a series of partitions, B B, projecting from their upper edge, supporting the gratebars in their proper place, defining the airspaces between them, and maintaining a constant air-space between the bearing-bar and furnace-walls, substantially as set forth.

In testimony whereof I have signed my name to this specication in the presence of two subscribing witnesses. f p

GEORGE D. PUTNAM.

Witnesses:

G. H. CROSBY, HENRY GoLLiNsoN. 

